Platen printing-press.



PATENTED MAY 26, 1903.

W. M. ROGKSTROH. PLATEN PRINTING PRESS.

APPLICATION FILED MAR. 23, 1901.

4 SHEETS-SHEET 1.

I0 MODEL.

No. 729,223. PATBNTED MAY 26, 1903.

W. M. ROGKSTROH.

PLATEN PRINTING PRESS.

APPLICATION Hum um. 23. 1901. 10 MODEL. 4 sums-sum 2.

YHEINoHmS PETERS co. mmouwo. WASNINGTON. u. c

4 SHEETS-SHEET 8.

PATENTED MAY 26, 1903.

s i mu RI GR M I n ONL II Rm 0 um WTm I0 MODEL.

No. 729,223. BATBNTED MAY 26, 1903. w. M. ROGKS'ITRQH.

PLATE-N PRINTING PRESS.

APPLICATION FILED HA8. 23, 1901. I0 MODEL.

4 SHEETS-SHEET 4.

ito. 729,223.

. ITED STATES Patented as, me.

PATENT ()FFICE.

PLATEN PRINTING-*PRESS.

SPECIFICATION forming part of Letters Patent No. 729,223, dated May 26,1903. Application filed March 23, 1901. Serial No. 52,548. (No model;)

To all whom, it new concern:

Be it known that I, WILHELM MAX ROCK- STROH, works manager, a subject ofthe Emperor of Germany, residing at Grenz street, Dresden-Heidenau, inthe German Empire, have invented certain new and useful Improvements inPlaten Printing-Presses, of which the following is a completespecification.

In a platen printing-press the inking-roller frame is moved, as is wellknown, by means of a lever which is moved up and down by means of a camand suitable connecting parts. In the case of large presses, however,the use of a cam is disadvantageous and interferes with the properworking of the various parts.

This invention has for its object to obviate the use of a cam bysubstituting toothed gearing therefor. It is obviously desirable todepart as little as possible from the usual type. In the present casethis has been kept in mind, as will be seen from the accompanyingdrawings, in which- Figure l is a side elevation of one example ofapparatus according to this invention. Fig. 2 is a sectional frontelevation. Fig. 3 is a side elevation of a modification, and Fig. 4. isa sectional front elevation of the modification.

For the purposehereinbefore mentioned it has been found most convenientin practiceto cause the roller-frame lever to be operated through theusual connecting parts by a crank which is either permanently connectedwith a toothed wheel driven intermittently by a main toothed wheel or isconnected by a clutch with a toothed wheel driven continuously by a maintoothed wheel.

In the example shown in Figs. 1 and 2 there is a main toothed wheel a,which is driven in any suitable manner and engages with a smallertoothed wheel I), that is rigidly connected to the crank c by means of ashort shaft (Z, mounted in bearings c. To the crank 6 there is connectedone end of an arm f, the opposite end of which is provided with a hookf, which bears on a pin 9 of an arm 7L, rigidly eonnected to the shaft'11 of the rollerframe lever 7t. As the lever 7.; has to make only oneupward-and-downward movement after each impression, the toothed wheel a,which is made much wider than the toothed wheel b, has a portion of itsperiphery re moved for a part of its Width, Fig. 2, so that the toothedwheel I) will be rotated only when it is in engagement with theunremoved portion of the periphery of the Wheel a, which will cause itto make onecomplete revolution. In order to insure this engagement, thetoothed wheel I) is provided at a certain place with an inserted piecel, with two large teeth on, which extend into the peripheral recess n ofthe main toothed wheel a, which is also provided at certain places withnotches 0 0, so that when 0 and m coincide the rotation of the wheel I)is effected systematically.

The recess n is of such a size that the wheel b makes only onerevolution and carries with it the crank e. The hook f is thereby forcedto move in the direction indicated by the arrow in Fig. 1 and to effectan oscillatory movement of the shaft 2' by means of the arm 71, so thatthe roller-frame lever is is caused to move up and down. lVhen the wheelI) has completed an entire revolution, its teeth are disengaged from thecomplete portion of the periphery of the Wheel a, and the teeth m of theinserted piece Z slide on the bottom of the recess a of the wheel a, sothat the wheel 11 comes to rest.

The modification shown in Figs. 3 and ediffers from that hereinbeforedescribed only in that the crank e is not rigidly connected to thetoothed wheel Z2, but is adapted to be connected therewith anddisengaged therefrom. The connection of the crank ewiththe rollerframelever 75 by means of the hooked arm f, the crank 7L and the shaft 2'remains unaltered. Moreover, in this case no portion of the periphery ofthe main wheel a is removed. Consequently the wheel Z), which is looselymounted on its shaft, rotates continuously during the rotation of thewheel a. The rotation of the crank c is effected as follows: On theshaft 9 of the crank a, mounted in the bearing there is mounted in ausual manner a sliding clutch 7', which is tapered at the side directedtoward the toothed wheel I), as will be seen from Fig. 4.. Rigidlyconnected to the shaft gis a friction-wheel s, which forms, with theinside of the rim of the toothed Wheel 1), a friction-clutch. Thefriction-wheel s is formed by a divided ring, against which there bearsin usual manner, at the point t, Fig. 3, a

IOO

lever 10, which is pivoted at o. The lever M has on its free end a pinw, which bears on the conical surface of the clutch 1' when the latteris moved in the direction indicated by the arrow in Fig. 4, and thusmoves the lever u laterally. The wheel 3 is thus pressed against theinside of the rim of the wheel b, so that the shaft 9 and the crank eare caused to move therewith. The devices '0, u, w, and 1' are of knownkind. Since the crank c has to make a revolution at certain times, theclutch r is only intermittently engaged. For this purpose the forkedclutch-lever 0c is pivoted to the arm 11 and is provided at its free endwith a roller 2', which rolls on the inside of the rim of the main wheela. The Wheel a has a projection Z, Fig. 3, which when it comes intocontact with the rollerz moves the lever x, and thereby operates theclutch r. The disengagement of the clutch r is effected by an abutment2, which acts at the proper moment on the upper portion of the roller 2and causes the lever 02 to move in the opposite direction. WVhen theclutch r is engaged, the crank 6 makes one revolution and operates theroller-frame lever 70 in the manner described with reference to thefirst example until the clutch is disengaged by the abutment 2.

Having now particularly described and as- 1. The combination with a maintoothed driving-wheel having a portion of its teeth removed and providedin the blank portion of its periphery with notches, of a second toothedWheel gearing with the main wheel, a toothed piece carried by the saidsecond wheel and the teeth of which piece are adapted to engage in thesaid notches, an oscillatable inking-roller frame, and connectionsintermediate said frame and the said second toothed wheel for thepurpose specified.

2. The combination with a main toothed driving-wheel, of a secondtoothed wheel intermittently rotated by the main wheel, a shaft uponwhich the second wheel is mounted, a crank on said shaft, an arm jointedat one end to the crank and having a hook at the opposite end, aninking-roller frame, an arm carried by said frame and a pin on said armengaged by the said hook.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

VV'ILHELM MAX ROCKSTROH.

\Vitnesses:

HERNANDO DE Soro. PAUL ARRAS.

